Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

The Board of Directors of Open Text Corporation

We consent to the use of:

•our report dated August 2, 2023, on the consolidated financial statements of Open Text Corporation (the “Company”), which comprise the consolidated balance sheets as at June 30, 2023 and June 30, 2022, the related consolidated statements of income, comprehensive income, shareholders’ equity and cash flows for each of the years in the three-year period ended June 30, 2023, and the related notes and

•our report dated August 2, 2023 on the effectiveness of internal control over financial reporting as of June 30, 2023

which are included in this Annual Report on Form 10-K of the Company for the fiscal year ended June 30, 2023.

We also consent to the incorporation by reference of such reports in Registration Statement Nos. 333-249181, 333-214427, 333-184670, 333-146351, 333-121377 and 333-87024 on Form S-8 and No. 333-261510 on Form S-3 of the Company.

/s/ KPMG LLP

Chartered Professional Accountants, Licensed Public Accountants

August 3, 2023

Toronto, Canada